Electric-lighting system.



BATENTED JULY 14,1908.

LP. MoBLRGY'. ELBGTRIC LIGHTING "SYSTEM.

APPLIQATIO! 111mm 103,15, 1905.

4 anima -sun 1.

[Vii/was J A 7.

[n vnler 'No. 893,534; PATENTED JULY 14-, 1908."

J. F. MoELROY. ELECTRIC LIGHTING SYSTEM.

APPLICATION: FILED NO A- 15, 1904.

4 SHEETS-SHEET liginfegff W Timer/Z0:

N0. 893,531. PATBNTED JULY 14-, 1908.

J. P. MQELROY.

ELECTRIC LIGHTING SYSTEM. APPLICATION FILED Nov 15,1004.

4 SHEETS-SHEET 4.

Wtn/esses,

" "f T1 1) fsT TEs'f-I ATEN OFFICE.

- eit izeniol fthef United States, residing a t- Al: l) any,' oo'unty of Albany, Stateof New York; i have nventedIc-ertain new and useful I111 v :niay be etnhodied.

-. shown July 2 8; 1899 relates to the charging of a stora-gephatt ery from a dy-nain'o running at an' panying drawings illustrate one form of the l-n'ventiongwhieh I now regard as the best out of the various formsin whiohthe invention My; inventio whieh isja portion of that in my application No. 725,433; filed interniittentnnd vaiiable speed and regu. lated fo'r a subst antiglly C nstant yoltage; It: is partieularly' suitablefor egdyna'mo "driven by an axle of a railway vehicle; which chargesa battery on the vehicle; the battery;

when charged, serving in any desired manner to supply r-urrent for electric: lamps or other cu'rrent eonsun ingdevices. In's'ueha'situw' tion it is needfu'l to disconnest the battery from'the dynamo. wheneyer t-he speed of the latter falls so low that it cannot enerate 'a potential e mum at leastthat of t 1e counter ..potent-ial'o thehsttery, and also to again connectthe battery to the dynamo when thespeed and potential'rise one-e inoreto the normal value. Hence there must be "a re-j peat-ed andautonmtie connection of battery to d1:.n'nnio,wvliiel1 may occur at times when l the hatter-y is'wholl or partly exhausted, in

\VlilLll event-"the normal. voltage of the eharg ing dynamo may send into the battery an ex cessive amount of current tending to injure it. or deer-ease the economy of the operation. It isfllcuh 'eitof my inventiontoso a d just, in at'cortiani'ewith the conditionof the hat-tor the standard of voltage. which the regulatortends-to maintain, in order that sue-h exnessis'e current will not occur. I

' I nowxproec-d to dessribe my invention, mferenl-efheing had to the zie-con panying drawings. v i v Figure- 1 ptiitthinn elevation and partly .a ldingranimati- .\'|t'-.w of a railway vehicle li hted 1);; my system: Fig. '3 is an elevation o tlrM-egittlut ing devise: Fig.3 is a pian view "the; i lt'i-i tiill'magnetz Fig. (Sis .a. pflanofjvin.

. specificationol Letters Pat e'nt sill of the I i i,' 1" v r a r 1' O A SX NEW YQBKMA S GNOBMT I@QNSQLIDATEDIQAM EATING CQMPANYpA CORPOBATIQN QE R 2 t H hfi.

Patented.

net Fig. 8 is'n detail-view of the over-nor;-

ful fieli'eoe.

Serial N01- 726;433L Dividedanil this appliationmpfi Rowland-15, V 1904. Sari- 11 110.232,; I iij L i v specti've detail iew of rllreostat' ,imtl its '55 -means o f connection w th the potential in ag- F ig.- 9. is a detail view'ofthe swito eonnecj- V -tion with a part broken. ewe}?- pro v,en1 ents 1nj Elect-r1o-Ltght1ng Systems, of, wh ch the following specification and aceomin whih'the whee 1 W 'and' thepulley w are mounted; Ahbutthe' ulley zq l errange'a belt-b Whit-h 0 Grates-t e' dynammfflfor't'he 'purposelofliol 'ng.'the. dynamo B a ainst thetension of thejbelt bfI -ar range afrot 'D pass-.

ing through thehraeket d', and fovide'd with 7 0 s ringdF-Whieh spring ten s to foreelthe lO forws-rci egainstthe strain otthe belt b.

It is advisable tojtnount the dynamo solftliat it i is ap ableip ff motion, for the reason; that curves, which tends't ol (inertia-strain onf'the the movement of thedynanio or slipping of the belt, which slipping I (lesire to avoid. By; mounting; the dynen' 'o on the er' I provide-for aseoniplishing this result;

, I m-ran beneath file can and Connect the dynamotherewith b the Wire E, which provides for supplying t e battery. Hist e negatije wire'of the storage b atte belt'andjrende'rs immmrj-to{mov es for a low forthfe;

e a'istorege battery E preierahly r i I i The're'gulat-ing de'fviee preferably inelo'se within the box J, and mountthe samein the car; The [regulating lmechanism, consisting p referably'of a t rain switeh K, potential ma net L, eurfeht-direetor M,rlie osta-t plate i resistance coils 0; motor P for 0 eratingthe rheostat, and governor Q for t he motor is preferablv connect-ed up rn". t-he-' f0llo\\-'1ng' manrier, see" Fig. 6.

The wire' whieh'gis eonnectedr withfthe director mane-inletof the branches B being. 105 I stora e buttery E isleonnected within the The motor Bis thus incircuitwith the stor 'age battery and the direction of themotor is determined by the current-director in said circuit. i v

The current director M is arrangedwith the branches R and R, provided with con tacts} at. each end, and the intervening bra ch R is suitably secured at its center to arm I secured to the plunger Z of the po- "t'e'iitial magnet L. It is apparent that when contacts are made with the central branch R .touching one end of the branch R and the" opposite end of the branch R, a current will be sent throu h the fields of the motor which will operate t 1e same in the o osite directionfrom that in which it'wili e operated when the opposite ends of the branch R are in contact with the opposite ends of the branches R and R. g

To the armature p of the motor P, I con- .nect at one end a worm p,"Fig. 2, adapted to engage with the rheostat gear wheel n, and thus to revolve the wheel, carryin the contact arm N, Figs. 2- and 6, on said plate N. On the other end of the armature 'p, I arrange a governor, shown in detail in Fig 8, provided with one or more weighted centrifugal arms Q, each adapted to rub upon thecircular centrifugal cont-actdisks g, g, mounted rigidly u on the insulating plate Q. One of the said disks 9 I co1me ctby wire Fig. 6, to the branch Rflon one side,-

of its pivotal support, while the other disk g, I connect, Tia the motor armature, by wire 9 to the branch RF, on the opposite side of its pivotal support. The wireg is connected to the brushes g,'g of the motor P. -As

"thus arranged, when the armature revolves too ra )idly; the weighted arms Q are lifted from the disks g, g, and the current is cut off from the armature; This tends to steady the motor and preventracing, which is liable to occur in apparatus adjusted as this is for regulating the flow of electricity through the circuit. v The train switch is made up of the magnets K, K, Fig. 2, there being, four mmmetcoils arranged, two upon the bar S, and 'two upon the corresponding bar S, The'bars 8 and S, the former beingstationary, the latter movable, tend' to attract or repel each other,- depending upon the current passing through the magnets, the two. bars being pivoted together .at'. their centers. Upon each of the magncts'I arrange two coils, one a series coil from the dynamo, represented in' thediagrammatic \'iew i1i;Figs. 1 and-6 by the heavy line, the other coil beingrof'fine wire,'whicl1 is in shunt with the storage batteryand dynamo. [The series coii is of heavy .wire, the'shunt coil' is "of fine wire. The contact pie'cc T is attached. tozone' arn-i S of thejswitch K. When the current through the magnets maguctizcslhe arms and'S -so that the) attract (at-(ll other, the

switch arm T is'bro'u ht in contact with the contacts and K. also connect the large. 'wire ofone of the magnets K with the large wire I in the potential magnet L, b means of the wire 14. The contact plate is connected with the large wire is inone of themagnets K, which passes through both of the magnets K, K", and, by the wire Z in the potential magnet L, is connected with the wire H and piasses to the storage battery. The magnets,

also have a fine wire coil K,

which is wound about the heavy coil of wire 'K and'wliich is connected with the contact is and with the wire f, Fig. 6, leading to the positive wire F. of the storage battery.

thus arranged, when the current is passing through the magnets K, the switch will be closed unless asutficiently low voltage is generated by the dynamo to cause themfluence of the series wire K, in the circuit from the battery, to overcome the influence of the small wire coil K upon the arms jS and S, and thereby demagnetize them. \Yhen that occurs, the spring 8 'will draw themagnets apartand break contact of the switch. It

will be remembered that the small-\rirecoil. m in shunt and so energized by the d 'namo,

while the series wire K receives the vnan'io current. Hence'the slowing up of the dT- na'mo 111 not only tend to weaken coils K and-K, but at a certain'point, the battc'n' current will tend to flow back through K" andso, by its reverse direction of flow will' overcome and neutralize the influence of K. The train-switch K thus serves as an automatic connection switch between the dy namo and battery and may bc'set to act at anv desired potential of the dynamo.

he potential magnet L, which I willnow describe. is made .up of two, coils, one of which is a series coil of a few turns of heavy wire'F, the other a shunt coil of a large number of turns of fine wire I, as shown in Fig. 5, and 'also shown diagramma'ticallr in Figs. 1 and 6,-said coils being prcfcrab ound on'a brass spool. The fine coil of; 'irc. I is connected with the wire the p itivc wirc otthe storage battery and d \'namt ),-i 1 ndalso with the wire il -extending from the'rhfeosl al arm, to the negative wire of thcjdgl mmo, being thus in permanent shun-t bcuxccn'llic positive and negative brushes. of thc dynamo on the dynamoside of themain switch K. The heavy wire I? is connected with tho wirc K, and also with the wire ll, couuccling with the negative wire of thc storagc battcrv. The potential. ma not thushn's a shunt circuit of fine wire ie'twecn thc i1lI-' serieswith the stora e imttcrr. "finllected moth-the currcnt-din-ctor M,'as al- I olcs of the dynamo,-an( 1 a series circuit o heavy wn-c torrent rector). I arrange a spring 1Q,

- spi'ing u'fada'pted to hold the.

connection'mthlthe' contact r,- I also ar ra'n'ge' ax-b nt lever X, one end of which presses -"b'e'n'eaththe lever V, and forces the contact 'into engagement with .the c'on'- spring X 's'uitably' mounted, the tendency seeker ,wli ich ever v lS rpvidedwith a contact-r: contactingwitlt't e 'contact r both contacts being infi tlre circuit" leading to the branch R f""the 'current'director. I arrange a tact wand 'htilds 'them -s'ecurely together; The =lever X is provided 'witha .tensiom ofwhieh sprin' 'iS "-l30"h'Ol(l/ the lever Xin con-.

tact witlitlie ever V. -The lever X is also prov-idec'l \t'i-tlfaportion a: which: passes be neathfther'heo'statlate N ,'its end re'stin beneath-the hinged ever'm, in' contact wit which "the lugs sc (see Figs: 3'a'nd 4) onthrh' eostat wheel'N engage until the wheel n has made'a' partial revolution. 'Byfthis det'i-c'eg th-e wheel' mjwhen at rest in-its off or h'oi'n'e' posit-ion, releases the contacts rf and-'1- (by-lug:t -striking-lever :c)-which are then under control of; thej plunger and will be opened; by the plunger coming in contact \vithfeatc'h '1: whenever the potential niagnet is denrgiizedasrby' the'stopping .of the -net--"IJ- recei\"es a curl ent of less than the refran and thespriri'g withdraws thepliin: 6G1 are in -the circuitleading from the battery to-the Inotor,,that circuit is thereby broken.

thus" preventin'g leakage of "battery current tl1rou'gh-"the n1otor-durin'g the time 'that that-rain and dynamo are standing still,

or' running soslowly that the potential mag.- net'is not-*strong. enough to draw in its plungcr a-gaijnst the' power of spring 10; "As thus ceives a'current'of more than the. required is (lraivn withihz-it; and contact isma: e. by -tl 1e'cur1'e'nt Ilirectoij: setting in motion the is at zero, addit-ional resistance is-fthrown in,

' g as the ,arm' passes from 21. around;

motor,wliich" rev0lves the 'rheostat wheel circuit-. "Conversely when'the. potential magqhird' 'titiibuntifor maintaining the voltage nndcontactis made by the current-director on the opposite contact-s,- setting in -.r notion the "motor in the opposite direction .wh-lch anclwdyuam'o :d'ecrease, until the-treserye pon -er 1 0f the fieldmagnet is exhau sted the same in contact with the s contact r in ain'st the catch. Since the contacts fall, the potentialmagnet eststillzlessr tur'ent -in shunt coil' lf and the backcurrent from the battery tends jtolflow inareverse-direction through its's'er .comes in contact with".

'tact with the lever V, and the plunger of 'the 0 because of the series. co'i'l-ffrom' the stora 'e strikesfihe catch 3), thereby breaking contact .betwee dynamo speed and voltage" the switch *K makescontact'and closes the circuit while and-so takes, additional currentlby its seriescoilL. also-draws in theplunger. C.onl-act" and the motor acts, under control of the'po tent-ia-l magnet, to. throw in o'r-outof circuit the field'magnet resistance 'ust as before.

tions of the resistance 0: to the. contact .plates n on the rheostat plate '3', the rheostat arm N being connected by the wire Z to- X; connectwith the ditfere nt -po'r't ions of "t he {resistance coil 0 n sueha'fmanner; that; as the arm passes from thecn11tact.n.,-.zrhere 1 t increasin the plate For the pu ose of reducing tlieningnctir' r) resistance of the potentiali ag tct L. so that g'er quickly and positively,- l -nrrungv air ron en\"el op 16,; F g 5 .tylnrlr furnishes a .one end of the ilnnger aruiiilit he winding to is providedl'trithopenings at Illthtllt'l of the magnet lat-li er than; the opening ,tl'nuugli 'which the ung'er l passcs. making a large. air gap, n this ay, the iron mn'vlnp does not come in c'ontact'\\'ith the plungk-r, nor so near the Sallie 'asto act-- upon the-plunger to.

mes coil "1'; 'JVVhen 'thisb'ack: current is so.

great- 'and' so. much resistance- :h'asi been thrown out,-that the -'hi fiionYthe'wheel-in, I e hinged lever '29:; it presses the bent lever X away from con;

.the otential magnet, becorning energized by its 3 unt coil-l =,-'an d if the batteryrequires,

other contact plates n on the rheostat plat e it shall magnetizeand .demagnetizc the phm good path for the lines Offl'bijfi to pass ,frmn

the opposite end; so hat-tho uinglictiell'uslstanee ls veryniuch redutml. ;.-jaul -1-n\'clop.

tential magnet becoming demagneti'zed" battery 0 crating upon the plunger and't e ,shunt coi from the dynamo-becomin neutralized, the spring 10 withdraws-the ever 1' attached to 'the plunger -.until "the; lever 1" and 1' and stopping the motor, and, at thesarnetime; the train switch-K," which is being acted upon in like manner by its shun-t and series coils, breaks its connec-Z .tion. Immediately upon the resumption of is also again made at r 1: in the motor circuit...

"It-Will be noticed, that 'te 5 ring '11 will X is removed! Thebent lever lz hen it en-.- I

holding contacts r lot) In F ig. 6 I show the wiring connecting per-.

the wire 7; leading to the negative wire of the The wire Zfconnects the contact preventjts'ifrpejunovement within the armashop arranged asdescribedj is an important part of my'jinv'ention The effects of the two-coils on the plunger are combined when the flow-:talies-place'from the dynamic to the battery and opposed when the current flows from thestorage battery to the dynamo a feature which makes the potential magnct stronger as the'flow of from the--dv-' namo .to the battery becomes greater, in .ivhich case. it requires a lower potential or i'o ltageon the shunt coil to draw in the plunaftgiven distance against the force of spring 10. -Siich lowervoltage or otential will then bemaintained (the efiect, owever, being slight because of the very few turns-' 55'turn's are shown in "Fig. 5of the series coil) in accordance with the magnitude of-the current flowing'to the battery,'-ivhieh lowermg of the voltage will, in turn, act to restrict or iniit the amount of current which the battery can receive. The two ,coils, acting as they dowhen opposed-to demagnetize the plungerthe current through one of the coils counteracting the current tliiou h the other and reducing the effect on the p unger to -z'ero with the iron envelop tendin to make th'eaction'of the 'coilinore direct orm an exceedingly sensitive and positivedevice foroperating-a current" director. For the purpose "of making a uniformly positive contactin the train switch, I referably arrange upon the contact piecesee 9,- thecontact plates"t,:t, wer s shaped and -n1a(l e .of spring metal and the contact pieces In and k are preferably arranged with 'two pieces, with fiarin ends, adapted to receivethe wed e-shap pieces t, t. The con- "tactplates k, 4 ar'ese'cured at their ends and ad'usted-by-meaus ofthe set-screws 1*,- pro-' V1 e'd'witha spring'upon each of thescrews, so as to allow' for'a giving at. the contact ends ,ofthe platesiii such a manner that the switch will, in closing, make a positive contact with "the plates on both sides of the tcry to 'the dynamo, reversing the flow through. the series coil on the train switch-- and on the potent al magnet,

wedge-sha ed portions t, t, even if the con-' tact piece .should'not be exactly true.

. The-o ratioriof my'invention is'ap arent.

Wheat recurrent generated by'the ynamo isless than suflicient, in voltage, to charge the storage hat "31hr? tendncywn'i be for the storage batterv to work back, and the .current will then flow from the storage batmotor.

its terminals.

when the battery is practically will cause-a the floweryoltag'e for the just explained scans;-

fl e y amb and at stora ciency in dynaiIiO, fisiltagev-sog lon as the dynamo speedjabove t-he criticallimit, by

battery, as above described. Of course t s" potential magnet will prevent such a deficausing the motor to; remove resistance from 'the dynamo field .magnet circuit and so;

I arno as its speed de-"L creases until'the unit -.of speed decrease strengthen the (1 reached. Beyond that-pomt the dynamo voltage will begin to drop until it is-less than magnetat which the detector will be opencircuited so as to deliver no current to the not calling u n the'motor to either increase or decrease t 1e resistance in the field magnet circuit of the dynamo. Obviously this satisfied condition of the regulator magnet is produced by the combined .efiect of the This may be. termed the satisfied condition, since at that time the magnet is series coil 'plus the shunt coil. If no current is flowing in the series coil then the shunt 'coilalone will be required to bring the magnet core tothis satisfied position but this will require alarger current'in' the'shunt coil, and consequentl a higher volt'a e a plied tr.

other words the s unt coil will then maintain a higher dynamo voltage, since suchhigher voltage will be required to bring the magnet core to the satisfied condition and any tendency of the voltage to drop will-be neutralized by the retraction of the magnet core, the closin ofthe moto'rcircuit by the director .and the operation of the motorto remove resistance from the dyv namo circuit and so cause it to increase in power sufficient toraise the vo'ltageto the aforesaid point at which the magnet will be satisfied. If, on the other hand, there is current flowing in the. series coil of the'magnet it'will tend to assist the action of the shunt 'coilso that the ,-latter. will re uire a smaller current and lower voltage to ring the magnet core to the sa-tisfi'edposition In other words, the-magnetwilllbe satisfied b and maintainia lesser dynamo voltage 'to t e extent that its ower is supplemented by the. current in tlie .s'eries 601i; Consequently exhausted and hence-hast; tow counter eiectroniot-ive force a la e currentwill tend to flow into .it

and in so. oin will pass through the aforesaid series' co on' th'e regulator magnet.

at to maintain a .10- voltagesTpracticallylmeet jand 'little' or no' the battery. For exaim; ".ple, the battery may at be inning takea cur-' at 60 v ts; the char y; ge

through the series coil and age" will 'be' increased in the .nianne'izalreadyeicplamed. This action will the battery and a gradualfrise in' .the voltage "fe t m 'e l5 re need and at the .same timethe volta counterelectromotive force of the battery equals the direct electromotive force of the' 2. 'f-At the same time no current will'fiow through alone to nain'tain' the dynamoyoltage 7Q of both battery and dynamo until the two current-flows into progresses thiscurrent will be gradua will gradually rise until at say 70 volts the dynamo and no currentfiows into the battery.'

the series coil' l? and the shunt coil I? will act volts.

"further supply,

After-1d e -e e y Has baited,-

and requires tad-raw upon the dyiiamo'fqr the normal. flow "of 'Icurrent through theseries coil to the battery will be resumed and as already describedfsuch current will-be limited in amount accordin 'to' the condition of the storage battery whie is thereby protected from injury'byan excess-' Jive current i w hausted.

flowing into when it 1s'- ex The motor controlling the :rheostat is operated by current from the storage batter, instead of the dynamo (being co n' necteg to thecircuit on the battery side of disconnecting switch K). This-enables me .to provide a positive and" reliable regulation. The motor must be made to move slowly (by the'governor above described.) in order to prevent racing and'if it wereo current fromthe dynamo and t e dynamo should suddenly sto (as bythe-breaking of a belt) or its fuse blow out, at a time when all or nearly all of the resistancewof the rheo' stat were in, sufficient time would not be.

given to Ill'lfilllOt-OI', to return the rlieostat to its zero position, before the switch K would open, or the voltageof the dynamo would' drop to such a point that the motor would not operate, but with my arran en'ient, when the dynamo stops, the-current From the storage battery will continue to operate the motor to throw out all of the resistance, regardless of the action of the decreasing dynanm current.

The current from a battery changed in the manner I have described may be utilized in' any desired way. For example m my appl cation No. 725.433, of whiclrthe prercnt ap- BI bythe same dynamo which charges the batpiirati'on is a division, the storage ban-cry is automaticallydrawn upon to supply inean descent lamps 'lllili menormally supplied on ue sth charging'proceeds} there being a gradual; defcrease in the amount of "current fl wi 1 5;;

Jup', to the level ,0f the dynamo but require the; battery su PP y during-the:periodsiwhen the. dynamo 18 at connected to the lamps as in the plan proposed rat leratent 6t .Mosko'witz', N0. 5,992, of September; 1 1', 1894 another. battery lamps and connected to the dynamorfor 'recharging ;jor a single batt'elymay be charged during the ,dayand .then :Iiisconnecled and used, at might;to'foperate the' lainps. 'In

. ba atsthesame itimefidisconnected-flvfrom' the.

Whateverwavthe current} from the charged blitte'ry'is utilized, the c'harging ofit from an intermittent and variable-speed dynamo be facilitated .andmade safe by my arrangement,- while, after thecharging is'com pletedfthe battery may remain connected to the [charging circuit for an indefinite period, since itspOtentiaI- islabout equal and opposite the*standard '-and maintained dynamo. potentialand littleor no-current will'flow thedynamo; Preferabl the standard. ynamo'potential will be sl .1 nt o'- the'b'attery and little or-no energy err-1.

' pended b ightly .higher then the counter'potential of the, batteryso that a'minute current, suflicicnt to hold tha'cha e, will flow after the charging .jsfinished hue; by employing aconstant potential (I' amo, the riseof the counter potential of tKE'batt'ery, as it becomes charged potential serves to-gradually taper off the charging current as the potentials become equalized. This avoids'theneed'forlspecial appliances to shut off the current from the battery when it is cpmpletely 'charged and gasing begins, such as are requirec whenbatteries are charged by a constant current with the varying poten-, tial involved therein, and a continuation of the normal amount ofimrrent-fiow into the battery, after-the charge is completed would be a mere waste of energy consumed in the decomposition of the battery liquidinto its component gases. v

by LettersPatent is: v

. 1. The combination with eye dynamo, ofa storage battery to be charged thereb and means dependent on the condition 0 the storage battery for limiting the current flowing into the battery during the charging period.- I 3 i The combination with. a variable-speed mo, of alstoragebattery to be charged a constant-potential regulator for What claim as new and desire to secure riable-speed J 4 the dynamo, and means ncluding a series coil'betwcen the dynamo and battery-for limiting" the current flowing to the battery dun'n the charging period; g

" e combination with a variablesp'eed dynamo, -of a. torage battery to becharged thereby," a constant potential regulator for the dynamic, and" means; dependent on the condition of the storage battery andresponding to the current'flowing into thebatteryduring the char ing' eriod, for limiting the potential applie to t e battery. g -4. The combination with aconstant po tential dynamo driven at avariable speed of a storage battery to be charged thereby, having its counter p tential dependent on the condition of its harge, an automatic connection-switch between dynamo and battery set to act at a determined dynamopontial and means for automatically limiting t e amount of charging current which tends to flow from the dynamo to the battery by reason of the difference between the main-1 tained potential and the variable counter-p'o-- ntial of the battery during the charging period.

5. The combination with a constant oten tial dynamo driven kit-variable spee of storage battery to be charged thereby and; having its counter potential dependent on the condition of its charge, an automatic connection-switch between the dynamo' and battery set to act at a determined dynamo potential, and means for ad'usting in'accordstandards at which the dynamopotentiali is' ance with the condition 0 the battery the maintained dun'ng the charging period.

a .6. The combination with a dynamo driven at a variables eed, of a storage battery tobe charged there y and having its counter po-- tential dependent on the condition of its charge, an automatic connection-switch set to'act' at a determined,dynamo otential, a regulator for the dynamo contro iled by the generated potential, as distinguished from its generated current, and means for automatically modifying the regulator according to the condition of the storage-battery during the charging )eriod;

7. The 'com inat-ion withadynamo driven at a variable speed, of a storage batter receiving a variable charging current there'- from, an automatic connection-snitch between the dynamo and battery set .to act ata determined dynamo potential, and means responding to the b attcry current for limiting" the char ing current according to the condition of the storage batter S. The combination with a variable'speed dynamo, of a storage battery to be charged thereby, a connection switch set to act at a determined dynamo potential, a regulator for the dynamo and a potential-ma et control lings'aid regulator and provide within finewire coil shunting the dynamo and a modify" ing coil .of coarse wire in series-with the battery so as to receive the-charging'current' flowing to the battery from the dynamor 9. A potential-regulating magnet for a battery-charging dynamo provi ed with a series-wound coiland a shunt-wound coil, combined with regulating devices controlled thereby said series-coil connected between the'storage battery-and the dynamo, and 1 said shunt coil. connected between the poles of the dynamo, so arran'ged as to'be actuated by both'diflerence ofotentiai-and flow between the dynamo an storage batteryf 10, A o tential-regulating magnet for a battery-c argingdyna'mo comprisin ashunf coil connected between the poles of the d Yr name and a series coil connected betweentlie dynamo and stora e batteryand so wound as to coo erat e with theshunt'coil when the current tiierein flows from the dynamo to they batter combined with contro ledthereby. s

1 1.The combination with a constant po-' teritial'dynamo driven at "ariable' speeds, of'

a. battery to be char ed thereby, .an autoregulating devices matic connection'switc between the "dynamo and battery, and means for 'modifying the potential applied by the dynamo to the battery during the charging period'to a pointlower than that required toovercome the maximum counter potential of the'battery and reducing such modification as the charg ing proceeds. I I

I 12. The combination with a. variable- 5 e'ed dynamo, 'of a storage battery to be c arged thereby, an automatic-connection switch between the battery and dynamo. a

regulator for the dynamo controlled by the potential as distinguisliei'l from the current generated by the dynamo, and means for antomatically reducing the potential at thc-heinning of a charge and e iminating suclrreuction as the chargin proceeds.

In witness whereofl have hereunto set my hand, before two subscribing witnesses, thi- 12th of November, 1904'.

1 JAMES F. iii-Emory Witnessesr p BEL'LAH CABLE, 1 r i WILLIAM A; MORRILL, Jr. 

